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package com.vaadin.tests.components.treetable;
import java.util.ArrayList;
import java.util.List;
import com.vaadin.tests.components.TestBase;
import com.vaadin.ui.Button;
import com.vaadin.v7.data.Container;
import com.vaadin.v7.data.Item;
import com.vaadin.v7.data.util.HierarchicalContainer;
import com.vaadin.v7.ui.TreeTable;
public class ProgrammaticSelect extends TestBase {
@Override
protected void setup() {
final TreeTable tt = new TreeTable();
tt.setContainerDataSource(buildDataSource(10, 100, 50));
tt.setSelectable(true);
addComponent(tt);
Button selectItem = new Button("Select first row", event -> {
Object id = tt.getItemIds().iterator().next();
tt.select(id);
});
addComponent(selectItem);
}
private Container buildDataSource(int properties, int items, int roots) {
Container.Hierarchical c = new HierarchicalContainer();
populateContainer(c, properties, items);
if (items <= roots) {
return c;
}
// "roots" roots, each with
// "firstLevel" children, two with no children (one with childAllowed,
// one without)
// ("firstLevel"-2)*"secondLevel" children ("secondLevel"/2 with
// childAllowed, "secondLevel"/2 without)
// N*M+N*(M-2)*C = items
// items=N(M+MC-2C)
// Using secondLevel=firstLevel/2 =>
// items = roots*(firstLevel+firstLevel*firstLevel/2-2*firstLevel/2)
// =roots*(firstLevel+firstLevel^2/2-firstLevel)
// = roots*firstLevel^2/2
// => firstLevel = sqrt(items/roots*2)
int firstLevel = (int) Math.ceil(Math.sqrt(items / roots * 2.0));
int secondLevel = firstLevel / 2;
while (roots * (1 + 2 + (firstLevel - 2) * secondLevel) < items) {
// Increase something so we get enough items
secondLevel++;
}
List<Object> itemIds = new ArrayList<>(c.getItemIds());
int nextItemId = roots;
for (int rootIndex = 0; rootIndex < roots; rootIndex++) {
// roots use items 0..roots-1
Object rootItemId = itemIds.get(rootIndex);
// force roots to be roots even though they automatically should be
c.setParent(rootItemId, null);
for (int firstLevelIndex = 0; firstLevelIndex < firstLevel; firstLevelIndex++) {
if (nextItemId >= items) {
break;
}
Object firstLevelItemId = itemIds.get(nextItemId++);
c.setParent(firstLevelItemId, rootItemId);
if (firstLevelIndex < 2) {
continue;
}
// firstLevelChildren 2.. have child nodes
for (int secondLevelIndex = 0; secondLevelIndex < secondLevel; secondLevelIndex++) {
if (nextItemId >= items) {
break;
}
Object secondLevelItemId = itemIds.get(nextItemId++);
c.setParent(secondLevelItemId, firstLevelItemId);
}
}
}
return c;
}
private void populateContainer(Container c, int properties, int items) {
c.removeAllItems();
for (int i = 1; i <= properties; i++) {
c.addContainerProperty("Property " + i, String.class, "");
}
for (int i = 1; i <= items; i++) {
Item item = c.addItem("Item " + i);
for (int j = 1; j <= properties; j++) {
item.getItemProperty("Property " + j)
.setValue("Item " + i + "," + j);
}
}
}
@Override
protected String getDescription() {
return "Programmatically selecting an item should not cause a complete repaint";
}
@Override
protected Integer getTicketNumber() {
return 6766;
}
}
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